A worker picks tea leaves in Tan Cuong village in Vietnam's northern Thai Nguyen province November 11, 2011. Vietnam produced 109,000 tonnes of tea worth $167 million between January and October in 2011, and black tea accounts for nearly 80 percent of Vietnam's exports. Pakistan, Taiwan, Russia, China and Indonesia topped the list of Vietnamese tea buyers between January and July, the Agriculture Ministry said. Vietnam is the world's fifth-largest tea exporter and producer. REUTERS/Kham (VIETNAM - Tags: AGRICULTURE BUSINESS COMMODITIES)